Portion of an electronic mouse



FIG. 1 is a front perspective view of a portion of an electronic mouse showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view thereof.

The broken lines immediately adjacent the shaded areas represent the bounds of the claim and all other broken lines are for illustrative purposes only. None of the broken lines form a part of the claimed design. 

The ornamental design for a portion of an electronic mouse, as shown and described. 